watchdog: sc520_wdt: Mark expected switch fall-through

In preparation to enabling -Wimplicit-fallthrough, mark switch
cases where we are expecting to fall through.

This patch fixes the following warning:

drivers/watchdog/sc520_wdt.c: In function ‘fop_ioctl’:
drivers/watchdog/sc520_wdt.c:326:3: warning: this statement may fall through [-Wimplicit-fallthrough=]
   wdt_keepalive();
   ^~~~~~~~~~~~~~~
drivers/watchdog/sc520_wdt.c:329:2: note: here
  case WDIOC_GETTIMEOUT:
  ^~~~

Warning level 3 was used: -Wimplicit-fallthrough=3

Notice that, in this particular case, the code comment is modified
in accordance with what GCC is expecting to find.

This patch is part of the ongoing efforts to enable
-Wimplicit-fallthrough.

Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>

diff --git a/drivers/watchdog/sc520_wdt.c b/drivers/watchdog/sc520_wdt.c
index 6aadb56e7faaa7161b8f32d8fd45a573e989e4a2..403542f9ed8dfd21b5bfcfc5e26ffbc3ca72b3d6 100644 (file)
--- a/drivers/watchdog/sc520_wdt.c
+++ b/drivers/watchdog/sc520_wdt.c
@@ -324,8 +324,8 @@ static long fop_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
                        return -EINVAL;
 
                wdt_keepalive();
-               /* Fall through */
        }
+               /* Fall through */
        case WDIOC_GETTIMEOUT:
                return put_user(timeout, p);
        default: